fix(@angular-devkit/build-angular): downlevel and optimize locale data

[clydin]

Locale data is now transformed to be compatible with the ECMAScript level of the application bundles. The locale data is also optimized to remove comments and unnecessary whitespace.

Fixes: #17497

[petebacondarwin]

Cool! So after this we could revert angular/angular@078b0be, right?

[clydin]

Yes. The referenced changes can be reverted with this in place.
The locale data can also target the latest ECMAScript version now since this will downlevel to the appropriate level for both older browsers and browsers that support modules.

[IgorMinar]

Yay! Thank you Charles!

I'll leave someone more competent to do the review and I'm happy to see that you sorted it out.

@petebacondarwin can you please help by rolling back the change from master?

This change also gives us an opportunity to in one of the next majors move the locale file into the most modern format and switch it over to esm format (eventually, not in v10).

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